I'm not suggesting to use his graphs to EQ directly, I wouldn't be trying to EQ that 5kHz dip in particular which really looks like a measurement artefact. I'm suggesting that his comparative measurements suggest the Ananda Stealth is very close to the Arya Stealth and that may indicate that
Oratory's EQ for the latter may be a good fit. (Or for that matter, the Edition XS EQ- as that is also very close).
It's worth noting that Oratory's EQ for the Arya Stealth, applied to VSG's measurements of the Nano, does match Harman pretty exactly all the way up to 4kHz. The Nano is using the stealth magnets from the Arya and now also the Nano diagphram from the Arya; I suspect it's extremely close in tonality.
VSG also has comparative graphs for other Hifiman egg headphones, all of which show remarkable similarity, and my personal experience with the four Hifiman egg headphones I have, is they are a lot more similar than different; I used Oratory's other EQs for the Arya Stealth and Edition XS before he came out with specific ones for those headphones, and honestly it wasn't much difference.
It's also totally valid to just EQ by ear, I usually prefer the Hifiman recession 1-3kHz so usually I just add a bass shelf skip that bit of Harman correction these days. But if he wants Harman, I think Oratory's Arya Stealth EQ, possibly tweaked in a few places regarding the specific peaks, is a good starting point.
@Phidel I don't think it's surprising you may want less bass, (1) the Ananda Nano is reported to have higher bass and (2) many people feel Harman is too much in the bass anyway for over-ear open backs.